No sound on the tv
As TV and DVD playing reproduces sound, you have to check TVs tuner function first. Connect the TV to external areal by connecting areal via areal socket. Make an auto-tune function. Refer the user manual about how to make an auto-tune to local on-air program. Make sure that, the TV reproduces picture and sound normally. If it is correct, your TV is perfect in all respect. If not, the tuner to your TV should be replaced with same type and number.